Wash the rosemary and shake dry. Wash lemon hot, rub dry and cut into pieces. Remove 2 cloves from the garlic bulb, peel and chop coarsely. Mix with 4 sprigs of rosemary and lemon pieces.
Season with salt and pepper. Set aside. Peel onions and cut into slices. Wash the zucchini, grate dry, clean, cut in half lengthwise and cut into slices of about 2 cm width. Wash and halve the tomatoes.
Quarter the garlic bulb. Mix vegetables and put aside.
Wash the chicken thoroughly on the outside and inside, dab dry and fill with the lemon-rosemary mixture. Tie the legs together with kitchen string. Pin the wings under the chicken. Place the chicken on the fat pan of the oven.
Season with salt. Pour on the chicken stock and bake in the preheated oven (electric cooker: 175 °C/ circulating air: 150 °C/ gas: see manufacturer) for approx. 1 1/2 hours. Approx. 30 minutes before the end of the cooking time, add the vegetables and the remaining rosemary to the chicken in the fat pan.
Arrange chicken and vegetables on a plate.